Massimo Pigliucci is an Italian-American philosopher and biologist who is professor of philosophy at the City College of New York, former co-host of the Rationally Speaking Podcast, and former editor in chief for the online magazine Scientia Salon. He is a critic of pseudoscience and creationism, and an advocate for secularism and science education.

Julia Galef is an American writer, speaker and co-founder of the Center for Applied Rationality. She hosts Rationally Speaking, the official podcast of New York City Skeptics, which she has done since its inception in 2010, sharing the show with co-host and philosopher Massimo Pigliucci and produced by Benny Pollak until 2015.